Module Content:

Module Reading, Problems, and Demo:

MAE 2320 Dynamics © E. J. Berger, 2011 0- 1

Module 0: WelcomeJanuary 20, 2011

1. Dynamics, the follow-on course in the engineering mechanics sequence which started with Statics, provides us with tools to examine the kinematics and kinetics of both particles and rigid bodies.2. Our course policies are similar to those from last semester, with a few small modifications based upon your input.3. This semester, you (yes, you) will be empowered to an even greater degree to control your educational experience.

Reading: Chapter 12Problems: statics review, including FBDs; math assessmentDemo: noneTechnology: course blog on Collab site

MAE 2320 Dynamics © E. J. Berger, 2011 0-

Administrative Details• professor: E. Berger (A-122 Thornton Hall, berger@virginia.edu)

• TA: Mr. Thomas Adam and Mr. Sae Woong Kil

• office hours and problem sessions details are TBD based upon your schedule

• meeting time and location: TR 9.30-10.45, MEC 3205

• about the course:

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Civil Engineering MAE 2320 - Dynamics

Kinema'c  and  kine'c  aspects  of  mo'on  modeling  applied  to  rigid  bodies  and  mechanisms.  Focus   on   free-­‐body-­‐analysis.   Use   of   work-­‐energy   and   impulse-­‐momentum   mo'on  predic'on   methods.   Use   of   Cartesian   and   simple   non-­‐Cartesian   coordinate   systems.  rota'onal  mo'on,  angular  momentum,  and  rota'onal  kine'c-­‐energy  modeling;  body  mass  rota'onal  moment  of  iner'a.  Rela've-­‐velocity  and  accelera'on.  Prerequisite:  MAE  2300.

Prerequisites & Notes Prerequisite: MAE 2300, APMA 2120.

Credits: 3

This Course information is from the Undergraduate Record 2007-2008.

MAE 2320 Dynamics © E. J. Berger, 2011 0-

Course Policies

• we follow the Honor Code, and the syllabus contains the SEAS-recommended wording (and some student contact information); all exams are pledged, homework assignments are not

• we will use the course blog on Collab, and I encourage you to sign up for a login so that you can post comments to the blog

• quizzes will be announced at least one class period in advance

• homework submissions must be in my hand at 9.30 am on the due date (i.e., the BEGINNING of the class period)

• excused absence does NOT NECESSARILY mean excused from work

• grade appeals must be submitted in writing within 1 week of the assignment return date for consideration

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MAE 2320 Dynamics © E. J. Berger, 2011 0-

Course Grading

• graded assignments:

• HW problem sets: both written and Mastering (12%)

• blog points: details to be distributed soon (3%)

• quizzes (15%): about 5 total

• exams: 2 midterms (20% each), 1 final (25%)

• project: creating and sharing educational materials (5%)

• attendance, participation, etc.: not explicitly part of the grade, but always useful...

• extra credit available...

• for problem solutions submitted and posted on the blog (this semester, ONLY electronic submissions will be accepted, and only the first 2 neat, correct, concise solutions received will be awarded credit)

• each extra solution is worth 1/4 of a homework

• excellent/useful/insightful commentary posted on the blog will also result in extra credit

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MAE 2320 Dynamics © E. J. Berger, 2011 0-

Consultation and Getting Help• your first step is always: come to class, work hard and

try to understand, perhaps even consult some friends, and after due diligence...

• your next step is to come see me: send email, visit during office hours, or make an appointment (phone is usually NOT the best way to reach me)

• other options: buy study guides such as the Schaum’s outline listed on the syllabus, pay a tutor

• friendly advice: join a study group of at least 2-3 people (including students from past sections), if not more; alot of great learning takes place in a collaborative environment like a study group

• more friendly advice: take advantage of review sessions and problem sessions--we will do these periodically and announce times and location in advance

• we will also link to lots on online content in support of the class

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Amazon, ~$14 (new)

MAE 2320 Dynamics © E. J. Berger, 2011 0-

Technology Content• how do we use these notes? (I’m not sure, actually, can you tell me?)

• a summary:

• blogging: we will use the course blog as a way to communicate--I encourage all of you to get an account and start hacking (subscribe!)

• podcasts: I will be podcasting all lecture modules and posting them on the blog; this also includes video problem solutions and tutorials

• video solutions: from the publisher’s website, as in Statics

• Collab: we will occasionally do some surveys, and we will use the gradebook features of Collab; otherwise we will use the course blog

• email: the usual

• a request: the success of some of this technology relies upon you participating, meaning you should work this into your DAILY study routine--check the RSS feeds, review the podcasts, post your course questions as comments on the blog, use email to communicate, etc.

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MAE 2320 Dynamics © E. J. Berger, 2011 0-

Course Objectives and Outcomes

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MAE 2320 Dynamics © E. J. Berger, 2011 0-

The Course Blog

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MAE 2320 Dynamics © E. J. Berger, 2011 0-

Lecture Podcast Content• the lectures are designed to contain the “static” course

content

• you can download and view these at your leisure

• the “dynamic” course content will be presented live in lecture, and NOT recorded

• the class period breakdown will usually be:

• ~30 minutes of recorded material which sets up the concepts, theories and applications

• ~20 minutes of NOT recorded material which includes physical demos, software usage, and collaborative problem solving

• ~25 minutes of something else (lecture, group work, problem solving, etc.)

• we will (maybe) try some pre-lectures, in which I record the lecture module ahead of time, you watch it, then during the class meeting we do 100% collaborative problem solving

• obviously this only works if you actually view the modules ahead of time...

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MAE 2320 Dynamics © E. J. Berger, 2011 0-

Video Problem Solutions• these Quicktime videos show complete

solutions to problems from our text, including narration and discussion

• they show several useful things:

• the solution, with all math

• the steps in the solution, including “what to watch out for”

• good problem solving technique

• relationships between this problem and others that we have solved

• the spoken word adds great value above the usual “static” written solution on the page

• download and use...you won’t regret it

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don’t forget...the companion website which has 75 videos to accompany the course!

MAE 2320 Dynamics © E. J. Berger, 2011 0-

Concept: Dynamics• from Hibbeler (p. 3): Dynamics is a branch of mechanics that “deals with the accelerated motion of a body.

The subject of dynamics will be presented in two parts: kinematics, which treats only the geometric aspects of the motion, and kinetics, which is the analysis of the forces causing the motion.”

• Mechanics: (engineering or applied) mechanics is the branch of physics concerned with the analysis of the action of forces on matter or material systems (www.answers.com)

• accelerated: in the F = ma sense

• geometric: concerning the path of motion, or trajectory of motion

• forces: forces, pressures, etc. exerted on a body by external means, including point loads, moments, torques, pressures, as well as body forces due to gravity

• why is dynamics important?

• understanding dynamics is key to predicting performance, designing systems, etc.

• the ability to control a system (say, a car) depends upon understanding the dynamics

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MAE 2320 Dynamics © E. J. Berger, 2011 0-

Some Examples:• the Boston Dynamics “big dog”

• Essex University’s robot fish

• a (very expensive) Mercedes crash test

• coordinate reference frames matter, as in this merry-go-round example

• ...and in this one...

• ...and a water experiment...

• helicopter dynamics (an RC example)

• a bowling ball

• Travis Pastrana’s double back flip or a massive whip

• and many, many others...

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MAE 2320 Dynamics © E. J. Berger, 2011 0-

Some Examples:• the Boston Dynamics “big dog”

• Essex University’s robot fish

• a (very expensive) Mercedes crash test

• coordinate reference frames matter, as in this merry-go-round example

• ...and in this one...

• ...and a water experiment...

• helicopter dynamics (an RC example)

• a bowling ball

• Travis Pastrana’s double back flip or a massive whip

• and many, many others...

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